I got mine and while excellent materials and craftsmanship, they wouldn't fit my cab and E120 either though not because of the clips per se but rather because the mounting holes had been predrilled based on different dimensions. A friend has them now to ask his friend with an automotive-oriented machine shop to trim the clips per my instructions to get them to fit.
Disclaimers: I'm happy to share whatever relevant gear knowledge or experience I have. Genuflection/payment/proof of worthiness neither sought nor accepted. I don't design, build, market, sell or endorse for pay any new music product or service. I occasionally sell personal used gear. I am an unpaid endorser of SoundScaper Productions and Godfrey Daniels Guitarworks.